I didn't know how to do it问题I didn't know how to do it这句话中为什么有to?是不定式吗?如果是,那为什么要用不定式表达?

I didn’t know how would they go to london. I didn't know how to do? I didn't know what to do? I didn't know that I do?这三句有什么区别啊? I didn't know what to do 与I didn't know how to do有什么区别 改错I didn't know how riding a mortor-bike.how riding 改为 how to ride. I know you love me,but I don't know how to face you,didn't know should accept you. I didn't know how likes being supposed to love是什么意思? I didn’t know that how to answer the question._______错在哪?为什么 I didn’t know 翻译I wanted to stand up for her.I just didn't know how to stop my schoolm She didn't know how to make a telephone call Forgive me ,I don't want this…… Didn't know how to face you 偶然看见, He asked me ,but I didn't know ______.A.how toHe asked me ,but I didn't know ______.A.how to tell.B.what to speak.C.to say that.D.what to say I didn't know ------ a.what to do b.how to do 选什么,详细点就更好了 I didn't know how to do it问题I didn't know how to do it这句话中为什么有to?是不定式吗?如果是,那为什么要用不定式表达? I don't know how to i don't know how to I didn't know that not important to you I Didn't Know 歌词